physics

Polje

Polje is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Polje rather than just read about it. In short: A polje, also called karst polje or karst field, is a large flat plain found in karstic geological regions of the world, with areas usually in the range of 5–400 km2 (2–154 sq mi). The name derives from the Slavic languages, where polje literally means 'field', whereas in English polje specifically refers to a karst plain or karst field.

Key takeaways

Polje belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Polje to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Polje from memory before moving on to harder problems.

Reference excerpt

A polje, also called karst polje or karst field, is a large flat plain found in karstic geological regions of the world, with areas usually in the range of 5–400 km2 (2–154 sq mi). The name derives from the Slavic languages, where polje literally means 'field', whereas in English polje specifically refers to a karst plain or karst field.

Geology A polje, in geological terminology, is a large, flat-floored depression within karst limestone, whose long axis develops in parallel with major structural trends and can become several miles (tens of kilometers) long. Superficial deposits tend to accumulate along the floor. Drainage may be either by surface watercourses (as an open polje) or by swallow holes (as a closed polje) or ponors. Usually, the ponors cannot transmit entire flood flows, so many poljes become wet-season lakes. The structure of some poljes is related to the geological structure, often fault lines, complex faults such as grabens and synclines, but others are purely the result of lateral dissolution and planation. The development of poljes is fostered by any blockage in the karst drainage. A polje covers the flatbottomed lands of closed basins which may extend over large areas, up to 1,000 km2. The flat floor of a polje may consist of bare limestone, of a nonsoluble formation (as with rolling topography), or of soil. A polje typically shows complex hydrogeological characteristics such as exsurgences, estavelles, swallow holes, and lost rivers. In colloquial use, the term "polje" designates flat-bottomed lands which are overgrown or are under cultivation. The Dinaric Karst has many poljes. They are mostly distributed in subtropical and tropical latitudes but some also appear in temperate or, rarely, boreal regions. Usually covered with thick sediments, called "terra rossa", they are used extensively for agricultural purposes. Some poljes of the Dinaric Alps are inundated during the rainy winters and spring seasons as masses of water called izvor or vrelo appears at the margins. The water disappears through shafts called ponor.

Prominent karst poljes are Livanjsko polje (about 60 km long and 7 km wide), Glamočko Polje, Grahovsko Polje, Drvarsko Polje, Duvanjsko Polje, Kupreška Visoravan (Kupres Highlands), Popovo Polje, Dabarsko Polje, Nevesinjsko Polje and Gatačko Polje in Bosnia and Herzegovina; Logatec, Planina, and Cerknica Polje in Slovenia; Grahovsko Polje and Nikšićko Polje in Montenegro; Ličko Polje and Krbava in Lika, Croatia; Begovo Pole in North Macedonia and Odorovsko polje. In Portugal, the town of Minde is located in a landscape of intensive karst. In the summer the polje is fertile fields, in winter, in case of heavy rain, a temporary lake. The former Lake Copais in Boeotia, Greece, fed subterranean channels (some artificial) until a 1957 land reclamation project drained it completely.

Etymology In its original languages, the word is synonymous with interior valley. The word polje (Cyrillic: поље) itself is of Slavic origin (best known as the root for the country Poland, Polska, from the Polish word pole 'field'). English borrowed polje from Slovene or Serbo-Croatian (Cyrillic: поље, pronounced [pôʎe]).

Notes

Illustrations

Worked examples

Example 1 — a first encounter with Polje

Start with the simplest possible case. Write down what Polje claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Polje before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Polje ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Polje

In research: Polje appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Polje in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Polje is common in secondary-school and first-year university syllabi. It links to neighbouring topics Karst fields, Karst formations, Physical geography, so understanding it makes those chapters shorter.
In everyday life: Look for Polje outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Polje in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Polje means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Polje out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Polje in simple terms?

Why does Polje matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Polje?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Polje.